Recently I have checked an option to globally deploy custom Office templates in Office 365. Unfortunatelly there is no such an option but there are two manuall steps:
What is a disconnector?
A staging object that is not linked to a metaverse object is called a disjoined object (or disconnector object). In other words, some attributes from your on-premises Active Directory are not correctly synchronized with Azure Active Directory.
Options to check\view disconnectors?